Are you using a ArcGISDynamicMapServiceLayer?http://resources.esri.com/help/9.3/arcgisserver/apis/flex/apiref/com/esri/ags/layers/ArcGISDynamicMapServiceLayer.htmlIf yes, you could create a timer to call refresh() on it every so often.e.g. setInterval(myDynLyr.refresh, 60000);http://livedocs.adobe.com/flex/3/langref/flash/utils/package.html#setInterval()
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